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The ALPS Mountaineering Crater Lake sleeping bag is quickly becoming a most popular rectangle bag. It uses 2-layer offset construction to eliminate cold spots. It is composed of Techloft+ Insulation. Techloft+ Insulation consists of multi-hole staple-length micro-denier fibers that have a siliconized finish for maximum insulation, loft, and compactness. This sleeping bag series is great for camping when weather conditions are cold and you want to stay warm.